How to perform validation on user input in Tkinter Python

Javascript Validation Libraries

The most powerful data validation library for JS

:100:Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving

Data parsing and validation using Python type hints

Validate your forms, frontend, without writing a single line of javascript

Decorator-based property validation for classes.

A popular .NET validation library for building strongly-typed validation rules.